Superconductivity in epitaxial La<sub>2-x</sub>Pt<sub>x</sub>Si films

ORAL

Abstract

In noncentrosymmetric superconductors, by doping with heavy-elements, the absence of inversion symmetry and presence of parity-violating antisymmetric spin-orbit coupling may lead to admixture of spin-singlet and spin-triplet components. We investigated the transport properties of various La2-xPtxSi thin films grown by molecular beam epitaxy (MBE). The Pt doping suppresses transition temperatures, and tunes the charge carrier types and densities dramatically. Interestingly, the magnetoresistance shows a two-step transition at finite temperatures below Tc. Furthermore, the differential resistance measurement reveals complex superconducting gap structures in magnetic fields up to 1 T. These features indicate the competing orders in the materials.

*This work was supported by UT Dallas research enhancement funds, National Science Foundation (NSF-DMR 1700137), Office of Naval Research (N00014-16-1-2657), and Center for Integrated Quantum Materials (DMR-1231319).

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Presenters

  • Jian Liao

    • Department of Physics, University of Texas at Dallas

Authors

  • Jian Liao

    • Department of Physics, University of Texas at Dallas

  • Yunbo Ou

    • Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology

  • Jagadeesh Moodera

    • Department of Physics, Massachusetts Institute of Technology, Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology

  • Xiaoyan Shi

    • Department of Physics, University of Texas at Dallas